samba - Jul 2009 - samba member of domain, user authenticated from AD

Hi,

I have a samba server which should be part of domain, and have a one
share accesibile by a group from AD.

How can this done?

I tried to put samba in domaine, comunicate with AD but i cpuldn't
make the AD users to autehniticate and access the share.

I am using ubuntu, and despite of several tutorial and how to's I
found it seems most of them are missing some info.

So, do you have a good trustable working way to do it?

Is it a solution to use ldap?

Gabi